package com.easy.util;

import cn.hutool.crypto.digest.DigestUtil;

public class PasswordUtil {
    private final static char[] arr={
            'a','b','c','d','e','f',
            '0','1','2','3','4','5','6','7','8','9',
            'A','B','C','D','E','F'
    };
    private final static int salt_index=5;
    private final static int count_index=15;
    public static String getEncryption(String password){
       //随机盐值
        int index_salt= (int)(Math.random()*arr.length);
        char salt=arr[index_salt];
        //随机加密次数
        int index_count= (int)(Math.random()*arr.length);
        char count=arr[index_count];
        String encryptionPassword=password+salt;
        for (int i = 0; i < count; i++) {
            encryptionPassword=DigestUtil.md5Hex(encryptionPassword);
        }
        System.out.println();
        StringBuilder strb=new StringBuilder(encryptionPassword);
        strb.insert(salt_index,salt);
        strb.insert(count_index, count);
        return strb.toString();


    }
    public static boolean checkPassword(String password,String encryptionPassword){
       // 获取盐值
        char salt=encryptionPassword.charAt(salt_index);
        // 获取加密次数
        char count=encryptionPassword.charAt(count_index);
        String decode=password+salt;
        for(int i=0;i<count;i++){
            decode=DigestUtil.md5Hex(decode);
        }
        StringBuilder strb=new StringBuilder(decode);
        strb.insert(salt_index,salt);
        strb.insert(count_index, count);
        return strb.toString().equals(encryptionPassword);
    }
    public static void main(String[] args) {
       System.out.println(getEncryption("123456"));
        System.out.println(checkPassword("password123","e79ccA436e323307dbc7dbeb65e8c284bb"));
    }
}
